public class Main2 {
    public static void main(String[] args) {
        String[] names = {"ABC", "XYZ", "zoo"};
        String s = names[1];
        names[1] = "cat";
        System.out.println(s); // s是"XYZ"还是"cat"?


        int a1 = 5;
        double a2 =(float)a1;

    }
}
